linux-kernel - [PATCH 3/4] BUG_ON on kernel misbehavior on A100U2W driver

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Date:	Tue, 15 Jul 2008 10:14:12 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	torvalds@...ux-foundation.org
cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] BUG_ON on kernel misbehavior on A100U2W driver

With broken Sparc64 IOMMU accounting, the kernel submits larger requests 
then allowed. Better to crash on BUG than corrupt memory. This needs to be 
fixed in sparc64 code.

For description of the crashes, see: 
http://www.uwsg.indiana.edu/hypermail/linux/kernel/0807.1/1465.html

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
---
  drivers/scsi/a100u2w.c |    1 +
  1 file changed, 1 insertion(+)

Index: linux-2.6.26-devel/drivers/scsi/a100u2w.c
===================================================================
--- linux-2.6.26-devel.orig/drivers/scsi/a100u2w.c	2008-07-14 20:03:43.000000000 +0200
+++ linux-2.6.26-devel/drivers/scsi/a100u2w.c	2008-07-15 00:46:02.000000000 +0200
@@ -866,6 +866,7 @@ static void inia100_build_scb(struct orc

  	count_sg = scsi_dma_map(cmd);
  	BUG_ON(count_sg < 0);
+	BUG_ON(count_sg > TOTAL_SG_ENTRY);

  	/* Build the scatter gather lists */
  	if (count_sg) {
--
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